Interesting article From an excellent publishing company "Wiley" 24 September 2020 :
"Coronaviruses (CoVs) are worldwide in distribution, infectious for a wide assortment of warm-blooded animals and birds, profoundly irresistible, and hard to control given their vast genetic variation, short generation time, and high mutation rates, which can inevitably prompt the rise of new viruses."
Coronaviruses in wild birds – A potential and suitable vector for global distribution
"The recurrent appearance of novel coronaviruses (CoVs) and the mortality and morbidity caused by their outbreaks aroused a widespread response among the global science community. Wild birds' high biodiversity, perching and migratory activity, ability to travel long distances and possession of a special adaptive immune system may make them alarming sources of zoonotic CoV-spreading vectors.""Coronaviruses (CoVs) are worldwide in distribution, infectious for a wide assortment of warm-blooded animals and birds, profoundly irresistible, and hard to control given their vast genetic variation, short generation time, and high mutation rates, which can inevitably prompt the rise of new viruses."